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1# This file is part of meas_extensions_scarlet. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (https://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <https://www.gnu.org/licenses/>. 

21 

22import numpy as np 

23 

24from scarlet.blend import Blend 

25 

26__all__ = ["LsstBlend", "checkBlendConvergence"] 

27 

28 

29def checkBlendConvergence(blend, f_rel): 

30 """Check whether or not a blend has converged 

31 """ 

32 deltaLoss = np.abs(blend.loss[-2] - blend.loss[-1]) 

33 convergence = f_rel * np.abs(blend.loss[-1]) 

34 return deltaLoss < convergence 

35 

36 

37class LsstBlend(Blend): 

38 """LSST Blend of sources 

39 

40 It is possible that LSST blends might require different 

41 funtionality than those in scarlet, which is being designed 

42 for multiresolution blends. So this class exists for any 

43 LSST specific changes. 

44 """ 

45 pass